<script>
import draggable from "vuedraggable";
import render from "@/components/render/render";

const components = {
  itemBtns(h, currentItem, index, list) {
    const { copyItem, deleteItem } = this.$listeners;
    return [
      <span
        class="drawing-item-copy"
        title="复制"
        onClick={(event) => {
          copyItem(currentItem, list);
          event.stopPropagation();
        }}
      >
        <i class="el-icon-copy-document" />
      </span>,
      <span
        class="drawing-item-delete"
        title="删除"
        onClick={(event) => {
          deleteItem(index, list);
          event.stopPropagation();
        }}
      >
        <i class="el-icon-delete" />
      </span>,
    ];
  },
};
const layouts = {
  colFormItem(h, currentItem, index, list) {
    const { activeItem } = this.$listeners;
    const config = currentItem.__config__;
    const child = renderChildren.apply(this, arguments);
    let className =
      this.activeId === config.formId
        ? "drawing-item active-from-item"
        : "drawing-item";
    if (this.formConf.unFocusedComponentBorder)
      className += " unfocus-bordered";
    let labelWidth = config.labelWidth ? `${config.labelWidth}px` : null;
    if (config.showLabel === false) labelWidth = "0";
    return (
      <el-col
        span={config.span}
        class={className}
        nativeOnClick={(event) => {
          activeItem(currentItem);
          event.stopPropagation();
        }}
      >
        <el-form-item
          label-width={labelWidth}
          label={config.showLabel ? config.label : ""}
          required={config.required}
        >
          <render
            key={config.renderKey}
            conf={currentItem}
            onInput={(event) => {
              this.$set(config, "defaultValue", event);
            }}
          >
            {child}
          </render>
        </el-form-item>
        {components.itemBtns.apply(this, arguments)}
      </el-col>
    );
  },
  rowFormItem(h, currentItem, index, list) {
    const { activeItem } = this.$listeners;
    const config = currentItem.__config__;
    const className =
      this.activeId === config.formId
        ? "drawing-row-item active-from-item"
        : "drawing-row-item";
    let child = renderChildren.apply(this, arguments);
    if (currentItem.type === "flex") {
      child = (
        <el-row
          type={currentItem.type}
          justify={currentItem.justify}
          align={currentItem.align}
        >
          {child}
        </el-row>
      );
    }
    return (
      <el-col span={config.span}>
        <el-row
          gutter={config.gutter}
          class={className}
          nativeOnClick={(event) => {
            activeItem(currentItem);
            event.stopPropagation();
          }}
        >
          <span class="component-name">{config.componentName}</span>
          <draggable
            list={config.children || []}
            animation={340}
            group="componentsGroup"
            class="drag-wrapper"
          >
            {child}
          </draggable>
          {components.itemBtns.apply(this, arguments)}
        </el-row>
      </el-col>
    );
  },
  raw(h, currentItem, index, list) {
    const config = currentItem.__config__;
    const child = renderChildren.apply(this, arguments);
    return (
      <render
        key={config.renderKey}
        conf={currentItem}
        onInput={(event) => {
          this.$set(config, "defaultValue", event);
        }}
      >
        {child}
      </render>
    );
  },
  // 联动容器
  unLinkageRow(h, currentItem, index, list) {
    const row = layouts.rowFormItem.call(this, h, currentItem, index, list);
    return <un-linkage config={currentItem}>{row}</un-linkage>;
  },
};

function renderChildren(h, currentItem, index, list) {
  const config = currentItem.__config__;
  if (!Array.isArray(config.children)) return null;
  return config.children.map((el, i) => {
    const layout = layouts[el.__config__.layout];
    if (layout) {
      return layout.call(this, h, el, i, config.children);
    }
    return layoutIsNotFound.call(this);
  });
}

function layoutIsNotFound() {
  throw new Error(`没有与${this.currentItem.__config__.layout}匹配的layout`);
}

export default {
  components: {
    render,
    draggable,
  },
  props: ["currentItem", "index", "drawingList", "activeId", "formConf"],
  render(h) {
    const layout = layouts[this.currentItem.__config__.layout];

    if (layout) {
      return layout.call(
        this,
        h,
        this.currentItem,
        this.index,
        this.drawingList
      );
    }
    return layoutIsNotFound.call(this);
  },
};
</script>
